Double tape drawing frame for spinning and similar machines



Sept. 16, 1941. 1.. SCHLIPP ETAL DOUBLE TAPE DRAWING FRAME FOR SPINNINGAND SIMILAR MACHINES Filed Jan. 20, 1940 hi0. Z 2/ Patented Sept. 16,1941 DOUBLE TAPE DRAWING FRAME FOR SPIN- NING AND SIMILAR MACHINESLudwig Schlipp, Kassel, and Max Boettle, Kass'el- Bettenhausen, GermanyApplication January 20, 1940, Serial No. 314,748 In Germany January 24,1939 Claims.

This invention relates to a double tape drawing frame for spinning andsimilar machines.

In double tape drawing frames the upper and lower tapes are usuallypassed separately each over a stationary bar at the forward turningpoint of the tapes in front of the front roller. In particular, one tapeguide system has been used in practice in which the two bars areinterconnected to form an equally sided fork. The

cross section of the two sides is so chosen that the two tapes arepassed over a narrow edge rather than over a larger surface. Theoperation of this double tape drawing frame is determined by the actualdistance between the two tapes.

This distance in turn is regulated by the spacing between the two legsof the fork. The distance between the two tapes which must be adapted tothe properties of the fibres to be spun can only be regulated by theprovision of various forks having larger and smaller distances betweentheir legs. It is a feature of this type of tape guide, however, by twofixed bars, that the tapes are bent out upwardly and downwardly betweenthis turning point and the drive above the cylinders in the middle ofthe drawing frame. Therefore, the fibres are mainly guided at theforward turning point. So far, this defect could only be remedied bypassing the inoperative or idle sides of the tapes over tightening barsor tension rollers.

It is an object of the present invention to prostructural forms, asillustrated by the accompanying drawing in which: v

Fig. 1 is a section of a tape guide system in a cage, having theinvention applied thereto.

Fig. 2 is an axial section through the guide or loading roller 1 and bar4 of Fig. 1.

Referring now to the drawing in greater detail, it will be seen that thelower tape 2 in the cage I is passed at its rear turning point over aroller ll, operating in a relatively elevated bight of said tape, and atits front turning point 3 over a flat bar I, in a forward lower bight ofsaid tape, where the roving leaves said tape. Bar 4 is ported insuitable recesses 5 of the cage I. The upper tape 6 passes over a rollerl2 at its rear turning point and at its forward turning point passesaround a loose loading roller 1 which is surrounded and supported by thetape 6. Roller I2 operates in a bight of upper tape 6 and is p0-'sitioned above roller Ii. Loading roller 1 is positioned over bar 4 in abight of upper tape 6 and is freely movable between the walls of cage l.Roller l presses upper tape 6 towards lower tape 2 at the point wherethe roving leaves said tapes. As shown in Fig. 2, the central portion ofroller 1 is recessed at 8 for exerting a resilient pressure upon theroving through the tape. The lateral flanges 9 of the loading roller Iserve as race rings which are engaged'by the tape 6. A small retainingmember It may be provided on each of the two walls of the cage I forpreventing the loading roller I from climbing upwards and moving towardsroller i2.

It will thus be seen that the upper and lower tapes 6 and 2 are guidedseparately, the lower tape being guided over the plate-shaped bar 4while the upper tape 6 is not guided in a rigidly defined position by abar but acted upon by the freely movable loading roller 1 which has a'predetermined diameter and weight. This roller 1 is merely placedwithin the uppertape 6'and, due to the inclined position of the drawingframe and under action of its own gravityten'ds. to tighten the tape 6.Since the upper tape 6"is continuously subjected to this tension, it iscaused to form a straight tangential line of connection between thenipping point between rollers ii and I2 and the return point at theloading roller I. Hence, the desired straight line guide for the uppertape 6 is achieved. The upper tape is made of such length as to placethe loading roller 1 over the plate shaped lower bar 4. Since this barhas a certain width lengthwise of the drawing frame, the loading rollerwill always be positioned over this bar and bear towards the uppersurface thereof, even in case of some elongation of the upper tape. Thelower tape 2 may be held under tension by any conventional means, ifrequired. In this manner, the fibres delivered between the two tapes areguided in the manner required for the spinning operation.

The central recess 8 in the loading roller I is so dimensioned asregards its width to correspond to the to and fro movement of the rovingcaused by the adjustment or changing of the feed lattice. Owing to thisrecess, therefore, the upper tape 6 is not rigidly but resilientlypressed formed with rounded forward edges and is supon, throughout thewidth of recess 8, by the loading roller 1. The 6 engages merely the twolateral fianges '9 of the roller I between which the recess 8 isdefined, while the tape 6 runs freely above the central portion of thebar 7 a resilient pressure exerted by our novel drawing frame the sameis rendered suitable for the spin-1 n'in'g of roving of a wide range ofdifferent thicknesses and material.

ing roller 1 and the resilient pressure exerted I The freely runningloadthereby enables the drawing frame to adapt itself automatically asrequired by the properties of the material of be spun. 1 a

The operation of our novel double tape drawing frame is alsoconsiderably facilitated. The upper tape G-may be removed from thedrawing frame independently ofthe lower tape 2 to carry out the cleaningwork from time to time. The lower tape 2 then remains in its normaloperative position, held by the bard.

Owing to the fact that the loading roller 1 is entirely covered by theupper tape 6 and has -no lateral guide pins, no fibre fly can bedeposited. Also, compared to the conventional guide system comprising afixed upper bar, less force is required to take the upper tape along.

The method and apparatus of the present invention have been described indetail with ref-,

erence to specific embodiments. It is to be un- (ierstood, however, thatthe invention is not limited by such specific reference but is broaderin scope and capable of other embodiments than guiding the lower tape at'the'point where the roving leaves the tapes, and a freely runningloading roller surrounded by the upper tape and positioned over saidbar, said roller being freely movable between the walls of the cage andadapted to tension the upper tape by its own weight and to press thesame towards the lower tape, said loading roller pressing said tapesyieldingly together against said bar at the point where the rovingleaves said tapes.

3. A double tape drawing frame comprising a cage, an endless lower tape,a roller operating in a relatively elevated bight of said tape, a guidebad in a forward lower bight of said tape where the roving leaves saidtape, said guide bar having a substantially flat upper surface,

those specifically described and illustrated in the drawing.

We claim:

1. A double tape drawing frame comprising a" cage, upper and lowertapes, a bar for guiding the lower tape at the point where the rovingleaves the tapes, and a freely running loading roller surrounded by theupper tape and posi-" tioned over said bar, said roller being freelymovable between the walls of the cage and adapted to tension the, uppertape by its own weight and to press the same towards the lower tape,

an endless upper tape, a roller operating in a bight of said upper tapeabove said roller of said lower tape, and a loading roller mountedfreely over said bar in a bight of said upper tape, said loading rollerbeing freely movable between the walls of the cage and adapted totension the upper tape by its own weight and to press the same towardsthe lower tape 'at the point where the roving leaves said tapes..

4. A double, tape drawing frame comprising a cage, inclined upper andlower tapes, a bar for guiding the lower tape at the point where theroving leaves the tapes, and a freely running loading roller positionedover said bar and surrounded by the upper tape, said roller being freelymovable between the walls of the cage and adapted to tension the uppertape by its own weight and to press the upper tape toward the lower tapeat the point where the roving leaves said tapes, the central portion ofsaid freely running loading roller being recessed to form lateral racerings engaging the inner surface of said, upper tape.

5. A double tape drawing frame comprising inclined upper and lowertapes, a bar for guiding the lower tape at the point where the rovingsaid loading roller pressing said tapes yieldingly together against saidbar at thepoint where the roving leaves said tapes.

2. A double tape drawing frame comprising a cage, inclined upper andlower tapes, a bar for leaves the tapes, said bar having a substantiallyfiat upper. surface, and a freely running loading roller within thelower bight of said upper tape' and positioned over said bar, saidroller being adapted to tension said upper tape by its own weight andyieldingly to press said tapes together at the point where the rovingleaves said tapes..

LU'DWIG SCHIJPP. MAXBOE'I'I'LE.

